Corsair RM750x Shift ATX v3.1 PSU Review

Efficiency Normal, Light & Super-Light Loads

Efficiency in power supplies is the percentage of input AC power converted to usable DC power for the system, with the rest lost as heat. For example, an 80% efficient PSU delivering 400W of DC power draws 500W from the AC source, losing 100W as heat.

The platform offers high enough efficiency in all load ranges.

Average Efficiency

The PSU’s average efficiency with more than 1450 different load levels at 115V and 230V is depicted in the graphs below.

The average efficiency meets the Cybenetics Platinum criteria.

Average PF

Power factor in power supplies is the ratio of real power (used to do work, measured in watts) to apparent power (total power drawn, measured in volt-amperes). It indicates how efficiently a PSU uses incoming AC power. A higher power factor (closer to 1) is better, as it means less wasted energy, reduced strain on electrical systems, and improved efficiency, often achieved through Active Power Factor Correction (APFC) in modern PSUs.

The APFC converter shows high PF at 115V, but at 230V, the PF readings are low.

Average Efficiency 5VSB

The 5VSB rail’s efficiency is high.

Vampire Power

Vampire power, also known as standby power, refers to the electricity consumed by a power supply unit (PSU) when it is plugged in but not actively powering a device, such as when a computer is turned off or in a low-power state, like sleep mode. This small, continuous draw (often a few watts) occurs due to background functions, such as maintaining standby rails (e.g., +5VSB for wake-on-LAN). Lower vampire power is better, as it reduces energy waste and lowers electricity costs.

Vampire power is low.

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6 thoughts on “Corsair RM750x Shift ATX v3.1 PSU Review

  1. You always praised Corsair for fan failure protection yet with this new shift line they don’t have it anymore you say. Also other protections are not to your liking either. I dislike Corsair because how they treat things so if there is a similar alternative then i chose that.
    I think the Pure Power 13 M is a good alternative based on your test and a newly released Dark Power 14 too which also performed well in your tests just no review up yet.
    Your test method for Inrush current is different now as you noted, the numbers are different, what threshold would you call good result?

    1. Most PSUs nowadays still don’t have fan failure protection, I am afraid. This is why I am pushing so much through reviews to force them to implement it.

      Below 100A is generally considered safe/ok.

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